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(No Model.) A. 0. SMITH. DEVICE FOR EXHIBITING MAGNETIO AND NON-MAGNETIG WATCH MOVEMENTS. No. 393,402. Patented Nov. 27, 1888.

N. PEI'EHS. PhMo-Llmagraphor, Washington, D. Q

:NITED STATES PATENT tries;

ALFRED G. SMITH, OF NEWV YORK, N. Y.

DEVICE FOR EXHIBITING MAGNETIC AND NON-MAGNETlC WATCH-MOVEIVIENTS.

SPECIFICATION forming part of Letters Patent No. 393,402, dated November 27, 1888.-

(No model.)

To all whom 236 may concern:

Be it known that I, ALFRED 0. SMITH, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Devices for Exhibiting Magnetic and Non-Magnetic Wat ch-Movements; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to mechanical exhibits for demonstrating the comparative properties and actions of the elements of magnetic and non magnetic watch movements when arranged in a magnetic field or under the influence of a magnet, and it relates particularly to exhibiting devices of this character for demonstrating the effect of magnetism on balancewheels and hair-springs made from different alloys or from different metals and alloys; and it consists in the improved construction and combinations or arrangements of parts, hereinafter fully disclosed in the description, drawings, and claims.

The objects of my invention are, first, to provide mechanical exhibits for retail watch-deaf ers for enabling them to practically demonstrate to customers the effects of magnetism upon watches containing magnetic and nonmagnetic elements in their movements, and to also enable them to avoid the objectionable result hitherto obtaining of magnetizing magnetic watches in testing or comparing the same with non-magnetic watches while demonstrating or explaining their differences; second, to provide a suitable support or base-plate upon which said magnetic and nonmagnetic-elements may be mounted and brought into a magnetic field or under the influence of a horseshoe or other suitable magnet; and, third, to provide a suitable box or casing for covering, protecting, and displaying said elements.

In exhibiting or comparing the properties and actions of magnetic and non-magnetic watch-movcments as hitherto practiced the magnetic movement becomes magnetized, and consequently seriously injured or useless, thus rendering such exhibition or comparison expensive and otherwise objectionable. Hence, as stated, for the purpose of enabling retail watch-dealers to intelligently exhibit and explain the differences in action and properties between a ma netic and a non-ma 'netic watchmovement under the influence of the poles of a magnet, I have constructed a device in which one or more magnetic balance-wheels and hairsprings, made, for instance, of steel or steel and brass, and a balancewheel and hair-spring made of a suitable non-magnetic alloy may be exhibited and explained by being set in motion and subjected to magnetic influence, thus effecting a practical demonstration of the comparative affections of the actions of said balance-whcels and hair-springs as made of the respective metals named.

My device is illustrated in the accompanying drawings, forming part of this specification, in which the same reference-numerals indicate the same parts, and in which- Figure 1 represents a top plan view of a disk-shaped support or base plate with the bridges, the balancewhcels, and the hairsprings sccu red thereto,an ordinary horseshoemaguetbeing also represented with its poles adjacent thereto; Fig. 2, a top plan view of a box or casing having a metallic back plate and periphery and a glass front with my device inclosed therein, an ordinary horseshoe-magnet being also represented in proximity thereto; and Fig. 3, a section of the same on the line a" a: of Fig. 2, the magnet being omitted.

In the drawings, the numeral 1 indicates a brass support or base-plate, which is prefer ably made in disk form; 2, the wall or periphery projecting upwardly therefrom, and3 the glass top or front, these parts constituting a suitable box or casing for protecting and displaying or demonstrating with my exhibiting device. Two or more bridges, 4E and 5, are secured to said base-plate; also, balance-wheels 6 and 7 are pivoted between the free ends of said bridges and base-plate, and hairsprings 8 and 9 are secured in place in the usual or any suitable manner.

The balancewheel 6 and hair spring 8 are made of non-magnetic alloys that is, alloys which will not be attracted or affected by mag: netisin or electricity-whilethe balance-wheel 7 and hair-spring 9 are made of magnetic metals, such as steel or steel and brass. hen said balance-wheels and hair-springs are set in motion by giving the base-plate or casinga sudden reciprocation or vibration with the hand and the magnet 10 is brought near them,

the balance-whccl and hair-spring which are made of the non-magnetic alloy or alloys will continue to vibrate and will not be affected by the magnet, while the balance-wheel and hairspring which are made of magnetic metal or metals will be quickly retarded and stopped by the magnet, and thus the comparative effect of the magnetic attraction for these parts can be readily demonstrated and understood; also, it is found in practice that when both the balance-wheels and hair-springs are at rest or not vibrated the magnet, when applied, will attract, start, and move the balance-wheel and hair-spring which are made of magnetic met als, while it will have no effect whatever upon the balancewheel and hair-spring made of nonmagnetic alloy or alloys. 3y means of this simple device the differences between and the advantages of the nonmagnetic elements of watch-movemen ts over those which are magnetic, when arranged in a magnetic field or in proximity to a magnet, may be easily demonstrated, and this without stopping, seriously affecting, or rendering useless an entire magnetic movement, as has generally been the result heretofore.

In my former invention, as disclosed in the patent granted to me February 21, 1888, No. 378,339, the display-stands for non-magnetic watches and watch-movements are designed to attract attention to the latter and show their non-magnetic properties while running in proximity to the poles of the magnets arranged upon said stands, which are displayed in the windows of jewelry stores, while my present device is intended to enable retail jewelers to practically and distinctly demonstrate to customers the difference in effect of magnetism upon some of the elements of magnetic and non-magnetic watclrmovements; also, in my former invention provision was only made for testing or comparing the effect and non-effect of magnetism upon complete watches or watchmovements, which in course of time seriously affected such movements as were made ofmagnetic metals and finally rendered them useless, whereas in my present invention I only employ portions of entire magnetic and nonmagnetic watchmovements, and thus avoid the necessity of injuring or destroying the whole of magnetic movements and at the same time simplify and cheapen my former construction.

I do not restrict myself to the employment of any particular construction of magnetic or non-magnetic balanec-wheels and hair-springs, as any of the various forms now existing may be supported upon the base plate 1 and used for demonstrating the effect and noneffect of magnetism thereon; also, the box or casing may be dispensed with and only the support or base-platc used in demonstrating, and other minor changes may be made in the construction and arrangements of the parts of my device without departing from the spirit of my invention.

Having thus fully described the construction and combination or arrangement of the several parts of my exhibiting device, its operation and advantages, what I claim as new 1s- 1. In a device for exhibiting the effect and non-effect of magnetism upon the elements of magnetic and non-magnetic watch movements, the combination of a support or base-plate, magnetic and non-magnetic watch-1novement elements mounted upon said support or baseplate, and a magnet which, on being alternately placed in proximity to said elements, will demonstrate their magnetic and non-magnetic properties, substantially as and for the purpose described.

2. In a device for exhibiting the effect and non effect of magnetism upon the elements of magneticand nonmagnetic watch-movements, the combination of a support or base plate, a magnetic balance-wheel and hair-spring and a non-magnetic balance-wheel and hair spring mounted upon said support or base-plate, and a magnet which, on being alternately placed in proximity to said balance-wheels and hair-springs, will demonstrate their magnetic and nonmagnetic properties, substantially as and for the purpose described.

3. In a device for exhibiting the effect and non effect of magnetism upon the elements of magnetic and non-magnetic watch-movements, the combination of a support or base-plate, bridges mounted thereon, a magnetic balancewheel and hair-spring and a non-magnetic balance-wheel and hairspring secured to said base-plate and bridges, and a magnet which, on being alternately placed in proximity to said balance-wheels and hairsprings, will demonstrate their magnetic and non-magnetic properties, substantially as and for the purpose described.

4. In a device for exhibiting the effect and non'effect of magnetism upon the elements of magnetic or nonmagnetic watch-movements,

the combination of the bridges, the magnetic and non-magnetic balance-wheels and hairsprings, and a suitable box or casing for covering, sup porting,and protecting said parts,snbstantially as described.

5. In a device for exhibiting the effect and non-effect of magnetism upon the elements of magnetic or nonmagnetic watch-movements, the combination ofa support or base-plate, the bridges mounted thereon, the magnetic and non-magneticbalance-wheels and hair-springs pivoted and secured between said bridges and base-plate, and a box or casing for inclosing and protecting said parts, which is provided with a glass top, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ALFRED G, SMITH.

Witnesses:

ALBERT H. TYRoLER, ROBERT S. HUBBEL. 

